netconsole: avoid OOB reads, msg is not nul-terminated
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.160, 6.12.103, 6.18.16, 6.19.6
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
In the Linux kernel, the following vulnerability has been resolved: netconsole: avoid OOB reads, msg is not nul-terminated msg passed to netconsole from the console subsystem is not guaranteed to be nul-terminated. Before recent commit 7eab73b18630 ("netconsole: convert to NBCON console infrastructure") the message would be placed in printk_shared_pbufs, a static global buffer, so KASAN had harder time catching OOB accesses. Now we see: printk: console [netcon_ext0] enabled BUG: KASAN: slab-out-of-bounds in string+0x1f7/0x240 Read of size 1 at addr ffff88813b6d4c00 by task pr/netcon_ext0/594 CPU: 65 UID: 0 PID: 594 Comm: pr/netcon_ext0 Not tainted 6.19.0-11754-g4246fd6547c9 Call Trace: kasan_report+0xe4/0x120 string+0x1f7/0x240 vsnprintf+0x655/0xba0 scnprintf+0xba/0x120 netconsole_write+0x3fe/0xa10 nbcon_emit_next_record+0x46e/0x860 nbcon_kthread_func+0x623/0x750 Allocated by task 1: nbcon_alloc+0x1ea/0x450 register_console+0x26b/0xe10 init_netconsole+0xbb0/0xda0 The buggy address belongs to the object at ffff88813b6d4000 which belongs to the cache kmalloc-4k of size 4096 The buggy address is located 0 bytes to the right of allocated 3072-byte region [ffff88813b6d4000, ffff88813b6d4c00)
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- Linux Linux
From c62c0a17f9b7398022f9eebe547878033264f81f · fixed in 68fe91df6ea822dae772fceaad0686e4f5839aec; From c62c0a17f9b7398022f9eebe547878033264f81f · fixed in 8fe132c4873f9eb1b86ddbf31216e9d961a0b8b9; From c62c0a17f9b7398022f9eebe547878033264f81f · fixed in 3126a2f98beaec5a554a1fb31c46db1e8542665e; From c62c0a17f9b7398022f9eebe547878033264f81f · fixed in 74ab1456eaa3b2eb986138f9e1f4cb37e73b6f58; From c62c0a17f9b7398022f9eebe547878033264f81f · fixed in 82aec772fca2223bc5774bd9af486fd95766e578
- Linux Linux
6.6
- KernelLinux
From 6.6.0 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.103; From 6.13.0 · fixed in 6.18.16; From 6.19.0 · fixed in 6.19.6